Explore topic-wise MCQs in Thermodynamics.

This section includes 14 Mcqs, each offering curated multiple-choice questions to sharpen your Thermodynamics knowledge and support exam preparation. Choose a topic below to get started.

1.

A_PISTON/CYLINDER_HAS_2KG_AMMONIA_AT_100_KPA,_50¬¨ àûC_WHICH_IS_COMPRESSED_TO_1000_KPA._THE_TEMPERATURE_IS_ASSUMED_TO_BE_CONSTANT._FIND_THE_WORK_FOR_THE_PROCESS_ASSUMING_IT_TO_BE_REVERSIBLE.?$#

A. -727.6 kJ
B. -794.2 kJ
C. -723.6 kJ
D. -743.2 kJ
Answer» B. -794.2 kJ
Discussion
2.

1KG_OF_WATER_AT_300¬¨ àûC_EXPANDS_AGAINST_A_PISTON_IN_A_CYLINDER_UNTIL_IT_REACHES_100_KPA,_AT_WHICH_POINT_THE_WATER_HAS_A_QUALITY_OF_90.2%._THE_EXPANSION_IS_REVERSIBLE_AND_ADIABATIC._HOW_MUCH_WORK_IS_DONE_BY_THE_WATER??$#

A. 371.2 kJ
B. 471.2 kJ
C. 571.2 kJ
D. 671.2 kJ
Answer» C. 571.2 kJ
Discussion
3.

A cylinder containing R-134a at 150 kPa, 10°C has an initial volume of 20 L. A piston compresses the R-134a in a isothermal, reversible process until it reaches the saturated vapour state. Calculate the required work in the process.$#

A. -1.197 kJ
B. -2.197 kJ
C. -3.197 kJ
D. -4.197 kJ
Answer» D. -4.197 kJ
Discussion
4.

A piston cylinder has R-134a at 100 kPa, –20°C which is compressed to 500 kPa in a reversible adiabatic process. Find the specific work.$#

A. -41.63 kJ/kg
B. -11.63 kJ/kg
C. -21.63 kJ/kg
D. -31.63 kJ/kg
Answer» E.
Discussion
5.

Water at 250°C, 1000 kPa is brought to saturated vapour in a rigid container. Find the specific heat transfer in this isometric process.$

A. ‚àí132 kJ/kg
B. ‚àí232 kJ/kg
C. ‚àí332 kJ/kg
D. ‚àí432 kJ/kg
Answer» B. ‚Äö√Ñ√∂‚àö‚Ć‚àö‚â†232 kJ/kg
Discussion
6.

Water at 250°C, 1000 kPa is brought to saturated vapour in a piston/cylinder with an isothermal process. Find the specific work.$

A. -38 kJ/kg
B. -138 kJ/kg
C. -238 kJ/kg
D. -338 kJ/kg
Answer» E.
Discussion
7.

A piston/cylinder has 2kg water at 250°C, 1000 kPa which is now cooled with a constant load on the piston. This isobaric process ends when the water has reached a state of saturated liquid. Find the work.$

A. -363.1 kJ
B. -463.1 kJ
C. -563.1 kJ
D. -663.1 kJ
Answer» C. -563.1 kJ
Discussion
8.

Compression and heat transfer brings R-134a from 50°C, 500 kPa to saturated vapour in an isothermal process. Find the specific work?#

A. -24.25 kJ/kg
B. -25.25 kJ/kg
C. -26.25 kJ/kg
D. -27.25 kJ/kg
Answer» D. -27.25 kJ/kg
Discussion
9.

An insulated cylinder fitted with a piston contains 0.1 kg of water at 100°C and 90% quality. The piston is moved, compressing the water till it reaches a pressure of 1.2 MPa. How much work is required in the process?$

A. -27.5 kJ
B. -47.5 kJ
C. -17.5 kJ
D. -37.5 kJ
Answer» E.
Discussion
10.

A cylinder-piston contains ammonia at 50°C, 20% quality, volume being 1 L. The ammonia expands slowly, and heat is transferred to maintain a constant temperature. The process continues until all liquid is gone. Determine the work for this process.$

A. 7.11 kJ
B. 9.11 kJ
C. 5.11 kJ
D. 8.11 kJ
Answer» B. 9.11 kJ
Discussion
11.

1kg of ammonia in a piston/cylinder at 50°C, 1000 kPa is expanded in a reversible isobaric process to 140°C. Find the work in the process.$

A. 50.5 kJ
B. 60.5 kJ
C. 70.5 kJ
D. 80.5 kJ
Answer» B. 60.5 kJ
Discussion
12.

1kg of ammonia in a piston/cylinder at 50°C, 1000 kPa is expanded in a reversible isothermal process to 100 kPa. Find the work for this process.$

A. 333.75 kJ
B. 343.75 kJ
C. 353.75 kJ
D. 363.75 kJ
Answer» E.
Discussion
13.

In a Carnot-cycle heat pump, heat is rejected from R-22 at 40°C, during which the R-22 changes from saturated vapor to saturated liquid. The heat is transferred to the R-22 at 0°C. Determine the COP for the cycle.$

A. 6.83
B. 7.83
C. 8.83
D. 9.83
Answer» C. 8.83
Discussion
14.

Hot air at 1500 K expands in a polytropic process to a volume 6 times as large with n = 1.5. Find the specific boundary work.

A. 309.5 kJ/kg
B. 409.5 kJ/kg
C. 509.5 kJ/kg
D. 609.5 kJ/kg
Answer» D. 609.5 kJ/kg
Discussion